Using this product is straightforward. First, make sure your vehicle model is a 2002 - 2021 Subaru EJ Turbo WRX or STI. If you have a 2002 - 2005 WRX, check if it needs a 2.5L STI oil pan, and for 2006 - 2007 WRX models, ensure you have an STI oil cooler and STI oil pan installed. Then, install the exhaust manifold, up - pipe, and use the included turbo gaskets, exhaust wrap, and hardware kits as directed. During installation, pay attention to the 3 - bolt flange design on the up - pipe to ensure a tight and stable connection. For maintenance, regularly check for any signs of air leakage around the connections. Clean the exhaust system periodically to keep the smooth inner surface of the pipes functioning well. This will help maintain the great exhaust flow and performance of your vehicle.